The board uses six disassemble amplifier tubes(used), 4 responsible for the left and right channels, the other two connected to BTL circuit for subwoofer use, wiring is very simple, especially for DIY.

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Specifications of DX-2.1 Large Power Audio Amplifier Board Channel High Power Subwoofer Dual Home Theater AC18-24V DIY Supplies

Ratings & Reviews of DX-2.1 Large Power Audio Amplifier Board Channel High Power Subwoofer Dual Home Theater AC18-24V DIY